OR/Disjunction

This lecture explains our second logical operation: OR, also known as a disjunction.

Takeaway Points

A disjunction strings two simple sentences together using a v, also called a wedge.

A disjunction is true if at least one of its simple sentences is true. This is in contrast to the “exclusive or,” for which both cannot be true. Be careful on this point when translating English sentences into logical expressions.

In English, disjunctions almost always have “or” separating the two sentences.